This is a list of sources for the texts in Vaughan Williams's Symphony No. 1, the "Sea" Symphony. All excerpts come from Walt Whitman's "Leaves of Grass".

"Today a rude brief recitative" to the end of the first movement
-- from the section Sea-Drift, "Song for All Seas, All Ships." RVW sets this poem almost entire.

II.
"On the beach at night, alone" to the end of the second movement
-- from Sea-Drift, "On the Beach at Night, Alone." RVW also sets this poem almost entire.

III.
"After the sea-ship, after the whistling winds" to the end of the third movement --
-- again taken from Sea-Drift, from "After the Sea-Ship," the complete poem is used.

IV.
"O vast Rondure, swimming in space . . . Now first it seems my thought begins to span thee"

"Down from the gardens of Asia descending . . . Who speak the secret of the impassive earth?"

"Yet soul be sure the first intent remains, and shall be carried out . . . "

"O we can wait no longer . . . Bounding O Soul thou journeyest forth"

"Away O Soul!" to the end

-- All the above are taken from the long poem "Passage to India"

The full text of the symphony can be found on Bernd Harmsen's site here.